Despite application of growth retardants and restrictive use of N fertilizers, cotton crop grown in North-Western India keeps on growing vegetatively. Since here flowering/fruiting generally conciles with monsoonal /rainy period as a result of which boll/fruit shedding takes place and little yields are obtained whereas overall biomass is very heavy.How can we mange such unwanted growth as excessive application of growth retardants like mepiquat chloride/stance etc esp during continued dry spell for 60 days is harmful and leads to super compression of nodal/inter nodal length.
I have no experience with cotton. Have you measured soil nitrogen? Is there perhaps a lack of potassium and/or phosphorous? Can you find a better cultivar that does not grow as tall?
You can try prohexadione calcium or trinexapac-ethyl, both works reducing gibberellic synthesis
A little water stress + inter-cropping of broad leaf crop may works
Soil N content is low to medium and P is also low,however K content is high to very high.
have you checked
Application of CCC (Cycocel and Chlormequat)@ 40ppm at 80-90 DAS that reduces the unproductive growth. Similarly application of chlorethyl-hydrazonium chloride (CMH) @ 480 & 720 g/ha reduces the growth as well
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CCC could not perform under such situations but other chemical has not been yet tried by me.
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